JEE Main · 2023 · 06 Apr 2023 · Shift 2 · s-Block Elements

Structure of

BeCl_{2}

in solid state, vapour phase and at very high temperature respectively are :-

(A)Dimeric, Polymeric, Monomeric
(B)Polymeric, Dimeric, Monomeric✓ Correct
(C)Monomeric, Dimeric, Polymeric
(D)Polymeric, Monomeric, Dimeric

Answer: (B)

Solution

BeCl_{2}

exists as a polymeric chain structure in the solid state due to chlorine bridging. In the vapour phase, it forms a chloro-bridged dimer. At very high temperatures (above 1200 K), the dimer dissociates to form monomeric

BeCl_{2}

. Hence the order is: Polymeric → Dimeric → Monomeric.

JEE Main · 2023 · 06 Apr 2023 · Shift 2 · Single correct option

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